[BUG] org-save-all-org-buffers reapplies startup visibility [9.5 (release_9.5 @ /usr/local/share/emacs/29.0.50/lisp/org/)]

[Marcel van der Boom <marcel@hsdev.com>]

Summary:
When calling `org-save-all-org-buffers` the initial visibility 
setting as specified in `org-startup-folded` or specified in 
=#+STARTUP: overview= will be applied to the org buffer in view.

My usecase is that `org-save-all-org-buffers` is called in an idle 
timer and makes working on org files annoying, as the outline 
keeps changing all the time, for example after returning from an 
interrupting phonecall.

To reproduce:

- create two files:

test.org:

--8<---------------cut here---------------start------------->8---
  #+SETUPFILE: ~/test-config.org

* Header one
  Test header folding on save all buffers
** Header two
  This will collapse after calling org-save-all-org-buffers
--8<---------------cut here---------------end--------------->8---


test-config.org;

--8<---------------cut here---------------start------------->8---
#+STARTUP:overview
--8<---------------cut here---------------end--------------->8---

- emacs -Q test.org
- make sure the outline is unfolded
- make a change so test.org is 'dirty'
- M-x org-save-all-org-buffers

Observed behaviour:
The outline in test.org will collapse and only show 'Header one'

Expected behaviour:
Outline state does not change on calling `org-save-all-buffers`




Emacs  : GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ 
Version 3.24.30, cairo version 1.17.4)
 of 2021-10-03
Package: Org mode version 9.5 (release_9.5 @ 
/usr/local/share/emacs/29.0.50/lisp/org/)